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Synthesis of novel proline-based imidazolium ionic liquids
Monatshefte für Chemie - Chemical Monthly ( IF 1.7 ) Pub Date : 2020-09-10 , DOI: 10.1007/s00706-020-02670-x
Snehkrishn A. Chaubey , Niranjan Patra , Roli Mishra

Abstract

A series of eight novel proline functionalized dipeptide imidazolium ionic liquids (DPILs), i.e. Boc-[Pro-Pro-EMIM], Boc-[Pro-Val-EMIM], Boc-[Pro-Ala-EMIM], Boc-[Pro-Phe-EMIM] containing [Cl] and [NTf2] anions were synthesized via a facile reaction of 2-chloroethylamine with four different dipeptides (Boc-Pro-Pro-OH, Boc-Pro-Val-OH, Boc-Pro-Ala-OH, and Boc-Pro-Phe-OH) followed by reaction with 1-methylimidazole and subsequent anion exchange. The synthesized ILs revealed similar characteristics of a conventional imidazolium ILs. The synthesized ILs were investigated by 1H NMR, 13C NMR, FT-IR, mass spectroscopy, TGA, and DSC. TGA revealed an improved thermal stability for NTf2 over chloride ion. DSC revealed a melting temperature less than 100 °C.

Graphic abstract



中文翻译:

新型脯氨酸基咪唑鎓离子液体的合成

摘要

一系列八种新型脯氨酸功能化的二肽咪唑鎓离子液体(DPIL),即Boc- [Pro-Pro-EMIM],Boc- [Pro-Val-EMIM],Boc- [Pro-Ala-EMIM],Boc- [Pro含有[Cl]和[NTf 2 ]阴离子的-Phe-EMIM]是通过2-氯乙胺与四种不同的二肽(Boc-Pro-Pro-OH,Boc-Pro-Val-OH,Boc-Pro- Ala-OH和Boc-Pro-Phe-OH),然后与1-甲基咪唑反应,然后进行阴离子交换。合成的IL显示出与常规咪唑ILs相似的特征。通过1 H NMR,13 C NMR,FT-IR,质谱,TGA和DSC研究合成的IL 。TGA显示NTf 2的热稳定性得到改善过氯离子。DSC显示熔融温度低于100℃。

图形摘要

更新日期:2020-09-10
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